Ocean heat uptake and interbasin redistribution driven by anthropogenic aerosols and greenhouse gases
Ocean heat uptake and interbasin redistribution driven by anthropogenic aerosols and greenhouse gases
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DOI：
10.1038/s41561-023-01219-x
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发表时间：
2023-06
影响因子：
18.3
通讯作者：
Shouwei Li;Wei Liu;R. Allen;Jia‐Rui Shi;Laifang Li
中科院分区：
文献类型：
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作者：
Shouwei Li;Wei Liu;R. Allen;Jia‐Rui Shi;Laifang Li
自工业时代以来，人为气溶胶和温室气体在调节海洋热量储存和分布方面发挥了重要作用。在这里，我们隔离和量化两者的影响，使用耦合气候模型模拟。我们表明，相对于工业化前的海洋，南大洋进口热量从印度洋-太平洋，但出口到大西洋的热响应于人为气溶胶。海洋热量吸收减少在亚极地大西洋。海洋环流和温度的变化对海盆间热交换的补偿作用较弱。因此，海盆间的热交换对海洋热吸收的变化有很大的贡献，从而改变了大西洋和印度洋-太平洋的储存热量。与温室气体有关的变化与与气溶胶有关的变化相反。人为温室气体促进了亚极地大西洋的海洋热量吸收，使南大洋从大西洋输入热量，但将热量输出到印度洋-太平洋。这种海洋热量重新分布的原因与气溶胶强迫情景不同，因为海洋环流效应被温度变化强烈抵消。因此，对于与温室气体有关的海洋热储存而言，流域间热交换的重要性远低于海洋热吸收的变化。我们的研究结果表明，气溶胶驱动的海洋环流和相关的流域间热传输的变化是更有效地改变海洋热分布比全球温室气体增加驱动。
Anthropogenic aerosols and greenhouse gases have played important roles in modulating the storage and distribution of heat in oceans since the industrial age. Here we isolate and quantify the effects of both using coupled climate model simulations. We show that, relative to the pre-industrial ocean, the Southern Ocean imports heat from the Indo-Pacific Ocean but exports heat into the Atlantic Ocean in response to anthropogenic aerosols. Ocean heat uptake diminishes in the subpolar Atlantic. Alterations in ocean circulation and temperature have a weak compensation in contributing to interbasin heat exchange. Consequently, interbasin heat exchange contributes comparably to ocean heat uptake changes to modifying the stored heat in the Atlantic and Indo-Pacific. The greenhouse-gas-associated changes are the opposite of the aerosol-associated changes. Anthropogenic greenhouse gases promote the ocean heat uptake in the subpolar Atlantic and allow the Southern Ocean to import heat from the Atlantic but export heat to the Indo-Pacific. The cause of this ocean heat redistribution is distinct from the aerosol-forcing scenario, seeing that ocean circulation effects are strongly offset by temperature shifts. Accordingly, interbasin heat exchange is much less important than ocean heat uptake changes for greenhouse-gas-associated ocean heat storage. Our results suggest that the aerosol-driven changes in ocean circulations and associated interbasin heat transports are more effective in altering oceanic heat distribution than those driven by globally increasing greenhouse gases.